Just disable broken __has_builtin(...) branches for GCC 15.

Author: frobtech

libcxx/include/__type_traits/add_lvalue_reference.h

@@ -18,20 +18,10 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if __has_builtin(__add_lvalue_reference)
+#if __has_builtin(__add_lvalue_reference) && __GNUC__ < 15
 
-#  if defined(_LIBCPP_COMPILER_GCC)
-template <class _Tp>
-struct __add_lvalue_reference_gcc {
-  using type = __add_lvalue_reference(_Tp);
-};
-
-template <class _Tp>
-using __add_lvalue_reference_t _LIBCPP_NODEBUG = typename __add_lvalue_reference_gcc<_Tp>::type;
-#  else
 template <class _Tp>
 using __add_lvalue_reference_t _LIBCPP_NODEBUG = __add_lvalue_reference(_Tp);
-#  endif //  defined(_LIBCPP_COMPILER_GCC)
 
 #else
 

libcxx/include/__type_traits/add_pointer.h

@@ -20,20 +20,10 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if !defined(_LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS) && __has_builtin(__add_pointer)
+#if !defined(_LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS) && __has_builtin(__add_pointer) && __GNUC__ < 15
 
-#  if defined(_LIBCPP_COMPILER_GCC)
-template <class _Tp>
-struct __add_pointer_gcc {
-  using type = __add_pointer(_Tp);
-};
-
-template <class _Tp>
-using __add_pointer_t _LIBCPP_NODEBUG = typename __add_pointer_gcc<_Tp>::type;
-#  else
 template <class _Tp>
 using __add_pointer_t _LIBCPP_NODEBUG = __add_pointer(_Tp);
-#  endif //  defined(_LIBCPP_COMPILER_GCC)
 
 #else
 template <class _Tp, bool = __is_referenceable_v<_Tp> || is_void<_Tp>::value>

libcxx/include/__type_traits/add_rvalue_reference.h

@@ -18,20 +18,10 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if __has_builtin(__add_rvalue_reference)
+#if __has_builtin(__add_rvalue_reference) && __GNUC__ < 15
 
-#  if defined(_LIBCPP_COMPILER_GCC)
-template <class _Tp>
-struct __add_rvalue_reference_gcc {
-  using type = __add_rvalue_reference(_Tp);
-};
-
-template <class _Tp>
-using __add_rvalue_reference_t _LIBCPP_NODEBUG = typename __add_rvalue_reference_gcc<_Tp>::type;
-#  else
 template <class _Tp>
 using __add_rvalue_reference_t _LIBCPP_NODEBUG = __add_rvalue_reference(_Tp);
-#  endif //  defined(_LIBCPP_COMPILER_GCC)
 
 #else
 

libcxx/include/__type_traits/decay.h

@@ -25,19 +25,9 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if __has_builtin(__decay)
-#  if defined(_LIBCPP_COMPILER_GCC)
-template <class _Tp>
-struct __decay_gcc {
-  using type = __decay(_Tp);
-};
-
-template <class _Tp>
-using __decay_t _LIBCPP_NODEBUG = typename __decay_gcc<_Tp>::type;
-#  else
+#if __has_builtin(__decay) && __GNUC__ < 15
 template <class _Tp>
 using __decay_t _LIBCPP_NODEBUG = __decay(_Tp);
-#  endif //  defined(_LIBCPP_COMPILER_GCC)
 
 template <class _Tp>
 struct _LIBCPP_NO_SPECIALIZATIONS decay {

libcxx/include/__type_traits/remove_all_extents.h

@@ -18,20 +18,14 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if __has_builtin(__remove_all_extents)
+#if __has_builtin(__remove_all_extents) && __GNUC__ < 15
 template <class _Tp>
 struct _LIBCPP_NO_SPECIALIZATIONS remove_all_extents {
   using type _LIBCPP_NODEBUG = __remove_all_extents(_Tp);
 };
 
-#  if defined(_LIBCPP_COMPILER_GCC)
-template <class _Tp>
-using __remove_all_extents_t = typename remove_all_extents<_Tp>::type;
-#  else
 template <class _Tp>
 using __remove_all_extents_t _LIBCPP_NODEBUG = __remove_all_extents(_Tp);
-#  endif //  defined(_LIBCPP_COMPILER_GCC)
-
 #else
 template <class _Tp>
 struct remove_all_extents {

libcxx/include/__type_traits/remove_extent.h

@@ -18,20 +18,14 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if __has_builtin(__remove_extent)
+#if __has_builtin(__remove_extent) && __GNUC__ < 15
 template <class _Tp>
 struct _LIBCPP_NO_SPECIALIZATIONS remove_extent {
   using type _LIBCPP_NODEBUG = __remove_extent(_Tp);
 };
 
-#  if defined(_LIBCPP_COMPILER_GCC)
-template <class _Tp>
-using __remove_extent_t = typename remove_extent<_Tp>::type;
-#  else
 template <class _Tp>
 using __remove_extent_t _LIBCPP_NODEBUG = __remove_extent(_Tp);
-#  endif //  defined(_LIBCPP_COMPILER_GCC)
-
 #else
 template <class _Tp>
 struct remove_extent {